I'm kind of confused by your description above. Could you please post a screenshot of your UFS page and your SnapRaid/Drives page?
Here is the UFS & Snapraid you asked for, this is how I have set it up.
Maybe SnapRaid does not like a parity drive made up of two pooled drives. I have never seen such a setup. If you have four 8TB drives only one of them needs to be your parity drive. One parity drive will cover up to four data drives of equal or smaller size EACH. You are loosing the use of 8TB of data space! Try reconfiguring according to the documentation and then give it a try. Even if you had five data drives the two parity drives required would not be pooled.
Here is the UFS & Snapraid you asked for, this is how I have set it up
Your first post and the above image are somewhat confusing, you have added the UFS mount points to SnapRaid 
The drives should be added to SnapRaid as individual drives, so 3x8TB for data 1x8TB parity.
Is it the case that I only need 1 parity for the 3 data drives and all data will be backed up onto the 1 parity drive.
The first part of the above is correct, the second part 'backed up' is not correct it stored parity information the best option is to look at the Snapraid Manual that will help you understand Snapraid. But what you have done is wrong and it's never going to work.
This guide is old but it's still good today
You have to ignore what you have setup in UFS, you have 4 drives, 3 of them you will set as data and the 4th as parity, so when you add them to Snapraid you will I think select each drive in turn and give it a name/label, then check data and content for the 3 data drives and the fourth drive you check parity only.
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